清空页面控件值

VisualTreeHelper提供可用于在 Silverlight 可视化树中遍历对象关系（以及子对象或父对象轴）的实用工具方法。

使用VisualTreeHelper的 GetChildrenCount 和GetChild 方法

public static int GetChildrenCount(
	DependencyObject reference
)

public static DependencyObject GetChild(
	DependencyObject reference,int childindex
)

例子:清空页面所有textBox的值

private void Clear(DependencyObject control)        {            TextBox txt = control as TextBox;            if (txt != null)            {                 txt.Text = "";             }            int txtCount = VisualTreeHelper.GetChildrenCount(control);            for (int i = 0; i < txtCount; i++)            {                DependencyObject txtSingle = VisualTreeHelper.GetChild(control,i);                Clear(txtSingle );            }        }